package com.gong.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.gong.reggie.common.BaseContext;
import com.gong.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器,支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest servletRequest = (HttpServletRequest) request;
        HttpServletResponse servletResponse = (HttpServletResponse) response;
        //1获取本次请求的URI
        String requestURI = servletRequest.getRequestURI(); //backend/index.html

        log.info("拦截到请求：{}",requestURI);//打印获取的请求地址 {}是通配符

        //定义不需要处理的请求路径

        String[] urls = new String[]{
                "/backend/**",
                "/front/**",
                "/employee/login",
                "/employee/logout",

                "/setmeal",
                "/user/login",
                "/user/sendMsg",
                "/addressBook/**",

        };

        //判断本次请求是否需要处理
        boolean check = check(urls,requestURI);

        //  如果不需要处理,则直接放行
        if(check){
            log.info("本次请求{} 不需要处理",requestURI);
            chain.doFilter(servletRequest,servletResponse);
            return;
        }
        //4、判断登录状态，如果已登录，则直接放行
        if(servletRequest.getSession().getAttribute("employee") != null){
            log.info("用户已登录，用户id为：{}",servletRequest.getSession().getAttribute("employee"));
            Long empId = (Long) servletRequest.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            chain.doFilter(servletRequest,servletResponse);
            return;
        }

        log.info("用户未登录");
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}
